Cylindrical honing tool



Feb. 10, 1931. w. F. EMERSON 1,791,491

CYLINDRICL KONING' TOOL Filed April 3, 1929 y 2f i; 2y u enema ret. 1e,1931 "unirse srarss P Willman r. EMERsoN, oFwILIQIAMsvILLn, NEW'YORKCYLINDBICL HON IN G TOOL Application filed April 3, 1929. Serial No.352,157.

This invention relates to the art of grinding or resizing vof thecylinder walls or bores of automobile and like internal combustionmotors and consists of an improved honing or grinding tool particularlyadapted for performing the operation of grinding with an improved degreeof accuracy and in any manner to obtain important advantages over thehoning structures as heretofore employed for the purpose.

The important features of the improved device'of the present inventioninclude the provision of means for adjusting the edectiveoperatingdiameter of the honing elements or stones to establish theoperating diameter of the tool with reference to varied sizes ofcylinder bores. to be operated upon; structural provision whereby upon asimpleinterchange of parts the tool may be adapted successfully tooperate upon substantially enlarged cylinder bores thereby to allow ofgreater utility; and improved arrangement for supporting and adjustingthe stones whereby in the honing or grinding operation the stones willbe positively adjusted to a given operating diameter and including theprovision of a supplemental spring adjustment arranged to importexpanding movement to the stones under a relatively light pressure so asto be operative to retai the grinder or tool within the bore againstdropping when the bore is finished and further adapted to impart a lightoutward pressure on the stones for finish'ng of the bore with a lighthoning action so as to give a polished finished surface.

The foregoing and other features and advantages of the present inventionwill be understood by reference to the accompanying drawings, whereinlike reference numerals are applied to the corresponding parts in theseveral views.

ln the drawings:

Fig. 1 is a view in side elevation of ahoning tool embodying thefeatures of the present invention;

Fig. 2 is a central vertical sectional view thereof;

Fig. 3 is a plan view thereof; and

Fig. 4 is a view in side elevation of a modified or elongated bearingsleeve element. j

ln the approved embodiment of the features kof the invention asillustrated in the drawings, 1 indicates a vertically elongatedcylindrical body or supporting member having a cylindrical bore oropening 2 extending therethrough of uniform diameter as shown. The bodyportion. is providedv with a series of radially extending upper'y andlower bearing apertures or openings 3 and l in vertical f alignment andequi-distantly spaced about the circumference thereof. These radiallydisposed bearingv apertures are outwardly elongatedbythe provision ofintegral shoulders or bosses 5, arranged to give increased bearing areaand to provide inner stopsf'for the honing elements 'associatedtherewith.

The honing elements consist of the carborundum composition or likeabrasive elements 6 fitted within metallic supportingtrays 7 of channelform and within which the abrasive is secured by suitable cement. Forthe supporting of the abrasive elements orstones,v bearing sleeves 8 arefitted within the respective bearing apertures 3 and 4, the sleeves 8being provided with inwardly lextending bores or openings 9, to receivepins or studs 10 rigidly secured by welding to the inner sides of thechannels 7. The pins 10, as indicated best in Fig. 2, areslittedinwardly from their free end portions to give an expansible grippingpressure forvresiliently holding the stone elements in assembledposition. AThe sleeve members 8 'at their inner end portions are formedwith enlarged conical bearing surfaces 12, for engagement withcomplemental conical surfaces of an adjusting member now to bedescribed.

For expanding or outwardly moving of the abrasive elements, there isprovided a centrally positioned'k adjuster or actuator member 14 formedwith upper and lower cy lindrical portions 15 and 16 having a bearingfit within the bore 2 of the body member 1 and formed at 17 and 18 withdownwardly and inwardly tapered or conical bearing portions positionedto engage the conical surfaces 12 o-f the stone bearing sleeves 8, The

adjuster member 14 is accordingly itted to be slidable vertical withinthe body member and by reason of the engagement of the conical surfaces,movement thereof will determine the outward position of the abrasiveelements or stones and accordingly establish the effective operatingdiameter. To control the adjusting movement ci the adjuster member 14and to accurately establish the operating diameter of the stones, meansare provided for controlling the movement of the actuator with amicrometer adjustment and indication. For this purpose the upper endportion of the body member 1, is externally threaded at to receivethereon an adjusting sleeve 21 internally threaded and provided at itsupper portion with a knurled manipulating portion 22. The adjustingsleeve 21 is formed at its lower end portion with an eX- ternal annulargroove 23 to receive the inwardly projecting ends of screw studs 24carried by an annular collar 25 closely fitting the sleeve 21 which isrotatable with relation thereto. The collar member .25 is provided withopposite radial bores 26--26 to receive the extremities of a connectingor coupling pin 27 passed centrally through apertures 28--28 formed inthe upper portion of the adjustor member 14. The constructionaccordingly provides, that upon rotation of the adjusting collar 21 theresulting vertical movement thereof will be imparted through the pin Q7to the adjustor member 14 and accordingly effect the adjustmentormovement of the abrasive elements through the conical surfaceengagement 'hereinbefore referred to. For accurately determining themovement of the stones in response thereto, the adjusting collar 21 isprovided with an indicatin mark or indentation upon the outer sur ace ofitsside wall andthe upper surface of the collar member 25 is providedwith a series of graduation marks to coact therewith for visiblydetermining the adjustment of the collar and thereby facilitate theadjustment of the stones to the effective operating diameter desired.

As shown in Fige 2 the upper end portion of the adjustor member 14 isformed with a centrally positioned recess or socket 3() within which ispositioned a coil spring 31 interposed under compression between thecoupler pin 27 and the bottom wall of the recess 30. operatively relatedthereto and as shown, the annular groove of the adjusting collar 21 andthe apertures Q8 in the upper portion of the adjustor member for thereception of the coupling pin 27 are vertically elongated to allow of alimited vertical movement or play of the pin 27.

The body member 1 at its upper end portion is suitably formed to haveflexible couling connection with a driving spindle 35 adapted forconnection with a portable driving motor. For this purpose the upperportion of the body member is formed with a bayonet slot 36 to beengaged by driving pin 37 carried by a spherical lower end portion 38 ofthe spindle 35. rlhe driving connection thus provided rotatably connectsthe body portion 1 to the motor driving spindle with a desired degree ofplay or flexibility allowing the motor and grinding tool to be manuallysupported and manipulated in the honing operation.

in accordance with the present invention, the strength oi the coilspring 31 is proporticned to impart a relatively light outwardpressure-upon the stones which may be said to be a supplemental andreduced pressure and is to a degree particularly adapted as a iinishingand polishing operation. Accordingly it will be understood that in theprimary grinding or honii 1^ operation, after inserting ot the toolwithin the bore, the adjusting collar 21 will be screwed downwardly toexpand the stones into tirm engagement with the cylinder walls, in whichoperation the spring 31 will be compressed to the limit allowed by thevertical play ot the pin 27, the pin at this time having engagement withthe lower wall of the recess QS. The primary grinding operation is thencarried out by the rotation of the tool and the progressive advancingoi. the adjusting collar to the degree desired, under which conditionsthe primary grinding operation is etlccted with a positive advance ofthe adjuster member distinct. from the resilient advance of said memberelllectcd by the spring 31. Subsequently, with the desired amount ofmetal having been moved from the bore, a continued. rotation of the toolby reason of the supplcmentalexpansion ot the stones under the influenceoi the s ring will effect a desirable polishing and finishing operationunder a relatively light pressure.

As will be further understood, the spring 31 further operates in adesirable manner to retain tlic honing tool trom falling within the boreand further operates to talte up the slack of the parts.

The improved structure as described is further desirable in that itprovides a rclatively wide operating range considered with relation tothe varied sizes of cylinder bores and vfurther in the instance ot boresot cessive diameter allows ot conveniently accon'nnodating the toolthereto by sub `tuting additional sleeve members 8 of increased length,though. utilizing the same and sto-nes, as illustrated in Figure 4.

liiihile I have here shown and described an improved embodiment of thefeatures of the present invention, it will be understood 'that variousmodiiications may be made tnerein without departing' from the scope otthe appended claims. 1t is therefore intended that such disclosure shallbe interpreted illustrat-ive and not in a` limiting sense,

Having described my invention, I claim:

l. A honing tool of the character described Icomprising a supportingmember having a longitudinal bore and radially disposed beartherein,bearing sleeves fitted tothe bearines and having inner conical surfaces,said sleeves having bores opening outwardly, abrasive elements havinginwardly extended pins fitted to the sleeve bores, an adjuster memberslidably iitted within the. bore of the supporting member and providedwith similarly disposed conical or inclined portions positioned toenga-ge the conical surfaces or" the sleeves, means for adjustably moving the adj ustor member to determine the position of the abrasiveelements comprising an adjusting sleeve threaded externally upon thesupporting member and formed with an annular slot, a collar fitted tothe lower end of the sleeve and having studs entering the groove, acoupling pin iitted to vertical slots in the supporting member and toopenings in the adjustor member and with its extremities litted toapertures in the collar, thereby to 'transmit axial movement of theadjusting sleeve to the adjustor member, the openings in the adjustermember for said pin being vertically elongated and said adjuster beingformed with a socket positioned beneath the pin and a compression springitted within the socket to engage the pin to be operative to exert anadvancing pressure to the adjuster member substantially as describe-d.

2. A honing tool oi' the character described comprising a supportingmember having' a longitudinal bore therethrough and radially disposedbearing kapertures therein, bearing sleeve members slidably fitted tothe apertures, said sleeve members having conical inner end portions andbores inwardly eX- tending from their outerV end portions, traysprovided with slotted pins i'itted to the sleeve bores, abrasiveelements carried by the trays and means for radially adjusting theabrasive elements consisting oil an adj ustor member axially movablewithin the supporting member and provided with conical portionspositioned to engage the sleeve conical end portions and means toradjusting the position of the adjustor member.

3. A honing tool of the character described comprising a supportingmember having a longitudinal bore therethrough and radially disposedbearing apertures therein, bearing sleeve members slidably fitted to theapertures, said sleeve mem ers having conical inner end portions andbores inwardly eX- tending from their outer ends, trays provided withslotted pins fitted to the sleeve bores, abrasive elements carried bythe tra-ys and means tor radially adjusting the abrasive elementscomprising an 'adjustor niember axially movable within the supportingmember and provided with inclined portions engaging the inner ends ofthe sleeves, positively acting means operative to move the adj ustor foradvancing the abrasive elements outwardly and supplemental resilientmeans associated with the positive adjusting means to be operative toimpart advance movement to the abrasive elements with a relativelylight-pressure for a linishing and polishing operation.

Signed at Butlalo in the county of Erie and State of New York this 11thday of March, A. B. 1929.

l/VlLLIAM F. EMERSON.

